Things I liked: First, I am glad they fit like a glove. there was an ease in removing the old seal.

Things I would have changed: I would, for those who don know how or have the courage to take chances, instructions would be nice. Because of the ease of removal, there remains an ease of these seals getting loose and lost. I like to place some very small amount of adhesive on the inside of the seal, just enough to keep it from falling out or being blown out.

Things I would have changed: I would for this set of seals, instructions. Of the five seal available in this set I was only able to use three. Thus two remain in the packaging unused. Not that I do not want to use them, it is how do you disassemble the pistole to replace them, not easy.